气相色谱-脉冲火焰光度法分析天然气中的硫化合物

采用气相色谱-脉冲火焰光度(GC-PFPD)技术,建立了含硫天然气中硫化合物形态分布的分析方法.考察了色谱分离条件对天然气中各种硫化合物分离的影响.采用硅烷化的惰性进样系统进样,根据标准物质保留时间的定性方法和外标定量方法对天然气中的硫化合物进行了定性和定量研究.结果表明:采用气相色谱-脉冲火焰光度(GC-PFPD) 法分析天然气中的硫化合物,操作简单,分析时间短,重现性好,对同一样品重复测定5次,相对标准偏差(RSD)在5%以内,方法的加标回收率在97.9%～101.3%之间,准确度满足分析要求.

Determination of Sulfur Compounds in Natural Gas by Gas Chromatography with Pulsed-Flame Photometric Detector

The method for separation and determination of sulfur compounds in natural gas was established by applying gas chromatography with pulsed-flame photometric detector. The effects of separation condition were discussed. Inert silanized sample injection system was used to inject. Qualitative and quantitative research of sulfur compounds in natural gas was established by using the retention time of the standard material and the external standard method. The experimental results indicated that determination of sulfur compounds in natural gas by applying gas chromatography with pulsed-flame photometric detector can simplify operation procedures and shorten analysis time, besides the repeatability of this method was very good. Five repeatable determinations of the same sample showed that the relative standard deviations of the sulfur compounds were less than 5% , and the recovery of the method was between 98.6% and 101.2 %. Accuracy of the method can meet analytical requirements.